Write the Oder of Rotational symmetry of a square and angle of rotational symmetry of a
rectangle.
18. Write any two rational numbers equivalent to -3/8
19. The perimeter of a rectangular sheet is 100 cm. If the length is 35cm, find its area.
OR,
Find the area of a circular bed whose perimeter is 88 m.
20. Express 729 X 64 as a product of prime factors only in exponential form.
Answers
Answer:
Write the Oder of Rotational symmetry of a square and angle of rotational symmetry of a
rectangle.
18. Write any two rational numbers equivalent to -3/8
19. The perimeter of a rectangular sheet is 100 cm. If the length is 35cm, find its area.
OR,
Find the area of a circular bed whose perimeter is 88 m.
20. Express 729 X 64 as a product of prime factors only in exponential form.
18. two rational numbers are = -6/16 and -9/24
19. we know that perimeter = 100
also perimeter of triangle = 2 x length + 2 x Breadth
so , 2l + 2b = 100
putting l = 35 cm
2 x 35 + 2b = 100
2b = 100 – 70
2b = 30
b = 15 cm
Now area = Length x breadth
= 30 x 35
= 1050 cm²
20. 729 x 64 = 3x3x3x3x3x3x2x2x2x2x2x2 or 3^6 X 2^6